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A1182EUA-T

P1-P3P4-P6P7-P9P10-P12P13-P15
Description
The A1180, A1181, A1182, and A1183 devices are sensitive,
two-wire, unipolar, Hall effect switches. The operate point, B
OP
,
can be field-programmed, after final packaging of the device
and placement into the application. This advanced feature
allows the optimization of the device switching performance,
by effectively accounting for variations caused by mounting
tolerances for the device and the target magnet.
This family of devices are produced on the Allegro
MicroSystems advanced BiCMOS wafer fabrication process,
which implements a patented, high-frequency, chopper-
stabilization technique that achieves magnetic stability and
eliminates the offsets that are inherent in single-element devices
exposed to harsh application environments. Commonly found
in a number of automotive applications, the A1180-83 family
of devices are utilized in sensing: seat track position, seat
belt buckle presence, hood/trunk latching, and shift selector
position.
Two-wire unipolar switches are particularly advantageous
in price-sensitive applications, because they require one less
A1180-DS, Rev. 14
Features and Benefits
▪ Chopper stabilization
▫ Low switchpoint drift over operating
temperature range
▫ Low sensitivity to stress
▪ Field programmable for optimized switchpoints
▪ On-chip protection
▫ Supply transient protection
▫ Reverse-battery protection
▫ On-board voltage regulator
▫ 3.5 to 24 V operation
Sensitive Two-Wire Field-Programmable Chopper-Stabilized
Unipolar Hall-Effect Switches
Continued on the next page…
Functional Block Diagram
Not to scale
Packages: 3 pin SOT23W (suffix LH), and
3 pin SIP (suffix UA)
A1180, A1181, A1182, and A1183
Amp
Regulator
Low-Pass
Filter
GND
VCC
GND
Package UA Only
0.01 uF
V+
Program/Lock
Programming
Logic
Offset
Clock/Logic
Dynamic Offset
Cancellation
Sample and Hold
Sensitive Two-Wire Field-Programmable
Chopper-Stabilized Unipolar Hall Effect Switches
A1180, A1181,
A1182, and A1183
2
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
Selection Guide
Part Number Packing
1
Mounting
Ambient, T
A
(°C)
Output
South (+) Field
2
Supply Current at Low
Output, I
CC(L)
(mA)
A1180ELHLT-T
3
7-in. reel, 3000 pieces/reel Surface mount
–40 to 85 Low 2 to 5
A1180LUA-T
4
Bulk, 500 pieces/bag SIP through hole
A1182ELHLT-T
4
7-in. reel, 3000 pieces/reel Surface mount
–40 to 85
Low
5 to 6.9
A1182EUA-T
4
Bulk, 500 pieces/bag SIP through hole
A1182LLHLT-T
4
7-in. reel, 3000 pieces/reel Surface mount
–40 to 150
A1182LUA-T
4
Bulk, 500 pieces/bag SIP through hole
A1183ELHLT-T
4
7-in. reel, 3000 pieces/reel Surface mount
–40 to 85
High
A1183EUA-T
4
Bulk, 500 pieces/bag SIP through hole
A1183LLHLT-T
4
7-in. reel, 3000 pieces/reel Surface mount
–40 to 150
A1183LUA-T
4
Bulk, 500 pieces/bag SIP through hole
1
Contact Allegro for additional packing options.
2
South (+) magnetic fields must be of sufficient strength.
3
This variant is in production, however, it has been deemed Pre-End of Life. The product is approaching end of life. Within a minimum of 6 months, the device
will enter its final, Last Time Buy, order phase. Status change: January 31, 2011. Suggested replacement: A1190LLHLX-T.
4
Variant is in production but has been determined to be NOT FOR NEW DESIGN. This classification indicates that sale of the variant is currently restricted to
existing customer applications. The variant should not be purchased for new design applications because obsolescence in the near future is probable. Samples
are no longer available. Status change: January 31, 2011.
wire than the more traditional open-collector output switches.
Additionally, the system designer gains inherent diagnostics
because output current normally fl ows in either of two narrowly-
specifi ed ranges. Any output current level outside of these two
ranges is a fault condition. The A1180-83 family of devices also
features on-chip transient protection, and a Zener clamp to protect
against overvoltage conditions on the supply line.
The output currents of the A1181 and A1183 switch
HIGH in the
presence of a south polarity magnetic fi eld of suffi cient strength;
and switch LOW otherwise, including when there is no signifi cant
magnetic fi eld present. The A1180 and A1182 have inverted out-
put current levels: switching LOW in the presence of a south polar-
ity magnetic fi eld of suffi cient strength, and HIGH otherwise. The
devices also differ in their specifi ed LOW current supply levels.
Both devices are offered in two package styles: LH, a SOT-23W
miniature low-profi le package for surface-mount applications,
and UA, a three-lead ultramini Single Inline Package (SIP) for
through-hole mounting. Each package is available in a lead (Pb)
free version (suffi x, –T) with 100% matte tin plated leadframe.
Factory-programmed versions are also available. Refer to: A1140,
A1141, A1142, A1143, A1145, and A1146.
Absolute Maximum Ratings
Characteristic Symbol Notes Rating Units
Supply Voltage V
CC
28 V
Reverse Supply Voltage V
RCC
–18 V
Magnetic Flux Density B Unlimited G
Operating Ambient Temperature T
A
Range E –40 to 85 ºC
Range L –40 to 150 ºC
Maximum Junction Temperature T
J
(max) 165 ºC
Storage Temperature T
stg
–65 to 170 ºC
Description (continued)
Sensitive Two-Wire Field-Programmable
Chopper-Stabilized Unipolar Hall Effect Switches
A1180, A1181,
A1182, and A1183
3
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
MAGNETIC CHARACTERISTICS
1
over the operating voltage and temperature range, unless otherwise specifi ed
Characteristic Symbol Test Conditions Min. Typ. Max. Units
Programmable Operate Point Range B
OPrange
I
CC
= I
CC(H)
for A1180 and A1182
I
CC
= I
CC(L)
for A1181 and A1183
60 – 200 G
Initial Operate Point Range B
OPinit
V
CC
= 12 V – 33 60 G
Switchpoint Step Size
2
B
RES
V
CC
= 5 V, T
A
= 25°C 4 8 12 G
Number of Programming Bits
–
Switchpoint setting – 5 – Bit
Programming locking – 1 – Bit
Temperature Drift of B
OP
B
OP
– – ±20 G
Hysteresis B
HYS
B
HYS
= B
OP
– B
RP
51530G
1
Relative values of B use the algebraic convention, where positive values indicate south magnetic polarity, and negative values indicate north magnetic
polarity; therefore greater B values indicate a stronger south polarity fi eld (or a weaker north polarity fi eld, if present).
2
The range of values specifi ed for B
RES
is a maximum, derived from the cumulative programming bit errors.
ELECTRICAL CHARACTERISTICS over the operating voltage and temperature range, unless otherwise specifi ed
Characteristic Symbol Test Conditions Min. Typ. Max. Units
Supply Voltage
1
V
CC
Device powered on 3.5 – 24 V
Supply Current
2
I
CC(L)
B >B
OP
for A1180; B <B
RP
for A1181 2 – 5 mA
B >B
OP
for A1182; B <B
RP
for A1183 5 – 6.9 mA
I
CC(H)
B >B
OP
for A1181, A1183
B <B
RP
for A1180, A1182
12 – 17 mA
Supply Zener Clamp Voltage V
Z(supply)
I
CC
= I
CC(L)(max)
+ 3 mA; T
A
= 25°C 28 – 40 V
Supply Zener Clamp Current I
Z(supply)
V
Z(supply)
= 28 V – –
I
CC(L)(max)
+ 3 mA
mA
Reverse Supply Current I
RCC
V
RCC
= –18 V – – –1.6 mA
Output Slew Rate
3
di/dt
No bypass capacitor; capacitance of the
oscilloscope performing the measurement
= 20 pF
– 36 – mA/s
Chopping Frequency f
C
– 200 – kHz
Power-On Time
4
t
on
After factory trimming; with and without
bypass capacitor (C
BYP
= 0.01 F)
––25s
Power-On State
5,6
POS t
on
t
on(max)
; V
CC
slew rate 25 mV/s – HIGH – –
1
V
CC
represents the generated voltage between the VCC pin and the GND pin.
2
Relative values of B use the algebraic convention, where positive values indicate south magnetic polarity, and negative values indicate north magnetic
polarity; therefore greater B values indicate a stronger south polarity fi eld (or a weaker north polarity fi eld, if present).
3
Measured without bypass capacitor between VCC and GND. Use of a bypass capacitor results in slower current change.
4
Measured with and without bypass capacitor of 0.01 F. Adding a larger bypass capacitor causes longer Power-On Time.
5
POS is defi ned as true only with a V
CC
slew rate of 25 mV / s or greater. Operation with a V
CC
slew rate less than 25 mV / s can permanently harm
device performance.
6
POS is undefi ned for t > t
on
or B
RP
< B < B
OP
.
P1-P3P4-P6P7-P9P10-P12P13-P15

A1182EUA-T

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Description:
MAGNETIC SWITCH UNIPOLAR 3SIP
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